Lets not forget the US.
Foreign embassies and consulates routinely use slave labor. The recent arrest of an Indian diplomat in NYC raised an international out cry. Not over slave labor, but over diplomatic immunity.
US farms, factories, and even quicky marts, use slave labor. Estimates put the annual number of slaves in the US as over 14,500.
As for Sochi, I will be rooting for the country with the crumbling infrastructure, anti-gay laws, sub standard health care, failing schools... USA! USA! USA!